Execs

Elixir Entity Component System. Abstracts away the mechanisms used to store, lookup, and retrieve data in an Entity-Component System.

Note that this application only provides the mechanisms for working with data and expects the consuming application to provide the "System" part of the equation.

WARNING: This software is new and has been minimally tested. Any feedback or suggestions would be welcome.

Including as Dependency

defp deps do
  [{:execs, "~> 0.5.0"}]
end

Managing database

There are six mix tasks provided as hooks for managing the lifecycle of the database:

• execs.schema.create
• execs.schema.delete
• execs.tables.create
• execs.tables.drop
• execs.setup
• execs.teardown

Which hooks to run will depend on the client being used. In the case of the Mnesia (default) client, a schema must first be created and then the tables can be created.

The setup/teardown tasks run both the schema and table creation and destruction tasks respectively.

Configuration

There are a few possible configuration values, with sensible defaults, for this package:

Key	Default Value	Affect
ai_table_name	ai_table	Name of the autoincrement table
data_table_name	data_table	Name of the data table
db_client	Execs.DbClient.Mnesia	Client module performs db interactions

Examples

These are some basic examples. See documentation and tests for more thorough coverage.

# Write a value to a single key, of a single component, of a single entity 
Execs.transaction(fn ->
  Execs.write(id, :foo, :bar, :foobar)
end)

# Write a value to a single key, of multiple components, of a single entity 
Execs.transaction(fn ->
  Execs.write(id, [:foo, :bar], :bar, :foobar)
end)

# Write a value to multiple keys, of multiple components, of multiple entities 
Execs.transaction(fn ->
  Execs.write([id, id2], [:foo, :bar], [:foo, :bar], :foobar)
end)

# Write a series of key/value pairs to a single component of a single entity
Execs.transaction(fn ->
  id
  |> Execs.write(:foo, :bar, :foobar)
  |> Execs.write(:foo, :bar, :foobar)
  |> Execs.write(:foo, :foo, :foobar)
  |> Execs.write(:foo, :foobar, :foobar)
end)

# Read an entire entity from database 
Execs.transaction(fn ->
  Execs.read(id)
end)

# Read the value of a single key from database 
Execs.transaction(fn ->
  Execs.read(id, :foo, :bar)
end)